I have used this as my abs exercise before ending my gym session and I found it is very useful.
Trust me, it will be a very very tough exercise, but I think this is what your abs like.
Do you want to build your abs muscles? Do you want to look good?
Here you go!
You even can do this at home, just need a joga map that's all.
Part 1
Part 2
Part 3
There are 4 more parts where I will post it tomorrow.
